Troubleshooting - Denon DVD-2200 Service Manual

TROUBLE SHOOTING
1. GU-3570 MAIN PWB
1.1. FL TUBE doesnít light
(1) Check the Set-up process of Panel µ-COM
Check Power Supply Voltages.
[IC301]:D1,D4
•
+3.3V_D1, +3.3V_D4
Check Oscillation Waveform.
[IC301]:
•
25MHz at 31pin.
Check Reset Signal.
[IC301]:
•
"H" level at 35pin?
Check Data Bus between
IC301 and IC302(Flash ROM):
Does the level change at FD(0--15)
•
Pins of IC301
Check Communication between
FLD Driver(GU-3571-3 [IC101])
[RST]:
"H" level?
•
Continue to next step.
Check the Set-up process of B/E µ-COM.
O.K.
O.K.
O.K.
O.K.
O.K.
N.G.
Check soldering.
CY121 on MAIN PWB.
•
N.G.
Check soldering.
X301 on MAIN PWB.
•
N.G.
Check soldering.
IC303(Reset IC) on MAIN PWB.
•
N.G.
Check soldering.(short-circuit,open)
FD(0--15), PA(1--16), PWE, PCE, POE,
•
N.G.
(1)Check soldering of CX171.
(2)GU-3571-3 is N.G.(No Good).
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DVD-2200